Read e-book online Advanced Ocean Modelling: Using Open-Source Software PDF

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By Jochen Kämpf

ISBN-10: 3642106102

ISBN-13: 9783642106101

This publication introduces the reader to complicated tools utilized in the computer-based modelling of fluid techniques. This contains nonhydrostatic strategies akin to breaking inner waves and density-driven convection, however the version code is usually used to simulate an El-Niño occasion! The publication comprises 25 functional workouts, utilizing freely on hand Open-Source software program suites, that are prevalent via the medical neighborhood. during this booklet, the artwork of hydrodynamic modelling is made on hand and obvious to a much broader readership. an enticing byproduct of the e-book is that effects are animations instead of nonetheless photos. version codes and animation scripts for all workouts are provided on an internet site. The reader can undertake version codes for personal self sufficient studies

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Read Online or Download Advanced Ocean Modelling: Using Open-Source Software PDF

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Additional info for Advanced Ocean Modelling: Using Open-Source Software

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For which value of h do the surface and bottom Ekman layers appear as separate features without overlapping? The reader is also encouraged to simulate Ekman-layer dynamics for the Southern-Hemisphere situation. Chapter 3 Basics of Nonhydrostatic Modelling Abstract This chapter introduces the reader to nonhydrostatic finite-difference solvers of the Navier-Stokes equations. For a start, the ocean is treated as as vertical slice. Flow and gradients of variables normal to this plane are assumed to vanish, and the Coriolis force is ignored.

1 The Governing Equations Density effects can be included in the vertical ocean-slice model by adding (a) an advection-diffusion equation for density and (b) the reduced-gravity force in the vertical momentum equation. 37) 36 3 Basics of Nonhydrostatic Modelling Note that, for convenience, the author has also included the nonlinear terms in the momentum equations. By splitting pressure into parts according to Eq. 39) with p = 0 at the sea surface. This ignores effects due to atmospheric pressure variations, which usually can be neglected.

56) We can therefore anticipate that there are always sufficiently short waves to create instability. Therefore, a two-layer shear flow is always unstable. This is known as the Kelvin-Helmholtz instability, first described by Thomson (Lord Kelvin) (1871) and Helmholtz (1868). Incidentally, this mechanism explains the generation of water waves by surface winds. 2 Instability of a Stratified Shear Flow Analytical solutions of the shear-flow problem can be derived under the assumptions that both the horizontal flow and density vary gradually with depth.

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Advanced Ocean Modelling: Using Open-Source Software by Jochen Kämpf

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